= FDO RFC 7 - Add New Methods to !FdoClassDefinition =

This page contains a request for comments document (RFC) for the FDO Open Source project.  
More FDO RFCs can be found on the [wiki:FDORfcs RFCs] page.

== Status ==
 
||RFC Template Version||(1.0)|| 
||Submission Date||July 25, 2007||
||Last Modified|| Barbara Zoladek [[Timestamp]]||
||Author|| Barbara Zoladek||
||RFC Status||draft ||
||Implementation Status|| under development||
||Proposed Milestone|| ||
||Assigned PSC guide(s)|| Greg Boone||
||'''Voting History'''||||
|| ||Bob, Mateusz||
|| ||Frank||
|| ||Orest||
|| ||Greg ||
 
== Overview ==

The purpose of this RFC is to enhance the !FdoClassDefinition class by adding new methods !GetIsViewBased() and !SetIsViewBased().


== Motivation ==

Existing !FdoClassDefinition does not contain any information that would allow to determine a type of the base RDBMS object.
There are cases when view-based classes should be distinguished from table-based classes to be able to handle behavioral differences:

* Editing schema. View definition cannot be changed and therefore class schema cannot be changed.

* Editing property values. Class data may not be editable.


== Proposed Solution ==

The following shows the proposed changes to !FdoClassDefinition:

{{{
     class FdoClassDefinition : public FdoSchemaElement
     {
        ...
        public:
            ...
            /// \brief
            /// Gets the value of m_IsViewBased. It is true if a class is based on view; otherwise is false.
            /// 
            /// \return
            /// Returns bool
            /// 
	        FDO_API bool GetIsViewBased();

	    /// \brief
            /// Sets the value of m_IsViewBased. It is true if a class is based on view; otherwise is false.
            /// This is an internal method that can only be called by providers. Application should not use this method.
            /// 
            /// \return
            /// Returns nothing
            /// 
	        FDO_API void SetIsViewBased( bool value );
            ...
        
         private:
            ...
            FdoBoolean	m_isViewBased;
            ...
       }

}}}
== Implications ==

This change will not cause any functional or performance side effects.

== Test Plan ==

Exisitng unit tests will be enhanced.